<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div class="app">
        <ul>
            <li v-for="(item,index) in list" :key="index">
                {{item.txt}}
                <button @click="del(item.id)">删除</button>
            </li>
        </ul>
        <button @click="fn">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '.app',
            data:{
                list:[
                { id: 1, txt: '1' },
                { id: 2, txt: '4' },
                { id: 3, txt: '7' },
                ],
            },
            methods:{
                fn(){
                    const sum = parseInt(Math.random() * 20+1)
                    console.log(sum)
                    this.list.push({
                        id: +new Date,
                        txt:sum
                    })
                },
                del(id){
                   this.list = this.list.filter(item => item.id !== id)
                }
            }
        })
    </script>
</body>

</html>